relnotes: update item about public schema permission change

Bruce Momjian <bruce@momjian.us>

Commit: f5135d2aba87f59944bdab4f54129fc43a3f03d0
Author: Bruce Momjian <bruce@momjian.us>
Date: 2022-06-28T20:35:32Z
Releases: 15.0
relnotes:  update item about public schema permission change

Also mention the bootstrap superuser.

Reported-by: Noah Misch

Discussion: https://postgr.es/m/20220628063719.GA2208244@rfd.leadboat.com

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doc/src/sgml/release-15.sgml modified +3 −5

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